This document presents testimony heard on S. 2418, a bill to authorize the Librarian of Congress to construct the Library of Congress Mass Book Deacidification Facility at Fort Detrick, near Frederick, Maryland, subject to the supervision and construction authority of a federal, civilian, or military agency. The facility would be used to neutralize acid in book paper, thereby extending the life of books in the library's collection by 400 to 600 years. The bill would authorize $11.5 million for a building to house the necessary equipment and its laboratory facilities. Deacidification costs in the mass facility are estimated to be $3-5 per book, substantially less than the alternative cost of approximately $30 for microfilming each book. Operating costs for this laboratory facility are expected to be between $2-3 million per year, including three or four new positions to staff the facility. The document includes testimony of Daniel J. Boorstin, Librarian of Congress; Beverly B. Byron, Congressional Representative from the State of Maryland; Carolyn Greiner, on behalf of Mayor Ronald N. Young, city of Frederick, Maryland; a panel including Carolyn L. Harris (Columbia University Libraries), Susan Martin (Johns Hopkins University), and Gary E. Strong (California State Library); and Steven W. Linger (President, Frederick County Chamber of Commerce). Prepared statements from each of the above participants and Wendell H. Ford, Senator from Kentucky, and a summary of the costs of the project prepared by the Librarian of Congress are included. (THC)